[A83] Re: statvars...??? [Ti83+]
[Prev][Next][Index][Thread]
[A83] Re: statvars...??? [Ti83+]
There's no reason MirageOS should need to save registers via pushing an
popping -- interrupt is what the shadow registers are mainly for. Any
program that uses shadow registers would DI before such code and EI
afterward. It doesn't seem as though there would be a very big gain to using
the shadow registers in a C compiler -- they're only efficient sometimes in
hand-coded assembly, and that's when you can create 2 distinct sets of
things that you need. Doing exx all the time is hardly efficient.
-----Original Message-----
From: assembly-83-bounce@lists.ticalc.org
[mailto:assembly-83-bounce@lists.ticalc.org]On Behalf Of Henk Poley
Sent: Friday, July 06, 2001 7:19 AM
To: assembly-83@lists.ticalc.org
Subject: [A83] Re: statvars...??? [Ti83+]
What mem-areas are used by Ion on the Ti83 anyways? I hate it that Joe
didn't document his shells like the others (exept Bill Nagel) did...
Could my interrupt-problem be related to that?
BTW: I found out what the 'bug' is when using the MirageOS interrupt with
the z88dk, the MirageOS interrupt probably *only* does a "exx \ ex
af,af"... [Most] z88dk programs also uses the shadow registers, so the
interrupt program should save them [too], like push/pop'ing them on the
stack.
To fix this I now just install my own interrupt, also when compiling for
MirageOS.
Henk Poley
References: